- Diversity Factor Definition: Diversity factor is defined as the ratio of the sum of maximum demands of individual loads to the simultaneous maximum demand of the system.
- Importance of Diversity Factor: A high diversity factor means that a smaller electrical source can serve more loads, making it commercially viable.
- Peak Load Timing: Different types of loads (domestic, commercial, industrial, etc.) have peak demands at different times, which helps in managing the overall load on the system.
- Calculation Example: For a power transformer with industrial, domestic, and municipal loads, the diversity factor is calculated based on their maximum demands and the transformer’s maximum demand.
- Application in Electrical Systems: Understanding and applying the diversity factor helps in designing efficient and cost-effective electrical systems.
We cannot store electricity, so we must generate it when needed. Electrical sources, like generating stations or substations, must meet the maximum demand of all connected loads. Fortunately, these maximum demands usually do not happen at the same time. Instead, peak loads occur at different times throughout the day. Because of this, we can build a smaller electrical source to serve many consumers. This is where the diversity factor comes in. The diversity factor is defined as the ratio of the sum of the maximum demands of individual loads to the simultaneous maximum demand of the system. For example, the maximum simultaneous load on a substation will always be less than the sum of the individual maximum demands, as they don’t occur at the same time.
Consider an electrical substation. The loads connected to it can be categorized into domestic loads, commercial loads, industrial loads, municipal loads, irrigation loads, and traction loads.
- Domestic loads consist of light, fans, refrigerators, heaters, televisions, air conditioners water pumps etc. The maximum demand for residential loads or domestic loads occurs typically at evening.
- Commercial loads consist of the lighting of shops and electrical appliances used in stores and restaurants. The consumption of load maximises during the evening as well as the daytime also.
- Industrial loads consist of heavy industrial machinery.
- Municipal loads consist of the street lighting system, water pumping system in water pumping stations. The consumption of these loads is not also consistent throughout 24 hours.
- Irrigation consumes power during daytime only.
- Traction loads become maximum during starting and ending of office hours just.
Now, we understand that the maximum demands of all loads connected to a substation do not occur at the same time. Instead, they happen at different times throughout a 24-hour period. This diversity in electrical loads allows us to build smaller capacity substations or utilities to serve larger connected loads.
Let us name an electrical substation as X. A, B, C and E are downstream substations connected to the substation X. The maximum demand of these substations is A megawatts, B megawatts, C megawatts D megawatt, and E megawatt respectively. The simultaneous maximum demand of the X substation is X megawatt. The diversity factor substitution would be 
The diversity factor must always be greater than one. A higher diversity factor is desirable as it makes the electricity utility business more commercially viable.
Now you are going to show you one practical example of diversity factor. A power transformer is connected to the following loads. The industrial load is 1500 kW, the domestic load is 100 kW and the municipal load is 50 kW. The maximum demand for the power transformer is 1000 kW. The diversity factor of the transformer would be
